Lacidipine is a dihydropyridine calcium channel protein inhibitor and blocker&period; Structurally&comma; trans Lacidipine is characterized by its cinnamate moiety&comma; which results in specific photochemical properties that differ from other dihydropyridine&period; Studies indicate that upon irradtiation with monochromatic radiation at λ&equals;313 nm&comma; cis Lacidipine &lpar;sc-217905&rpar; was degraded and the concentration of trans Lacidipine was increased&period; It is known that calcium channel blockers such as trans Lacidipine function by blocking voltage gated calcium channels on cell membranes of cardiac muscle and blood vessels&period; As a result of this inhibition there is a reduction in cardiac muscle and blood vessel contraction&period;